cover-view使用fiexd定位,定位的元素页面滚动过程中会抖动，搜了各种方法，最后使用弹出层里放textarea解决的，但是这个问题可能是新手机新版本的一个bug，均是真机出现的问题，

基础调试库：2.12.0 问题：同一个页面多个input，切换的时候，经常需要点击两次，才弹出键盘。 测试视频：https://v.qq.com/x/page/k3124ymlo83.html

<view class="story"> <canvas hidden="{{radarImg}}" canvas-id="canvas" type="2d" id="canvas" style="width: 100vw; height: calc(100vw / 750 * 1080);"></canvas> <image hidden="{{!radarImg}}" src="{{radarImg}}" style="width: 100vw; height: calc(100vw / 750 * 1080);" /> </view> openDialog: () => { console.log('openDialog()'); let ctx = wx.createCanvasContext('canvas'); // that.setData({ // radarImg: 'tempFilePath', // show: true // }); // console.log(that); ctx.draw(true, setTimeout(()=>{ wx.canvasToTempFilePath({ canvasId: 'canvas', success: function(res) { console.log(res); let tempFilePath = res.tempFilePath; that.setData({ radarImg: tempFilePath, show: true }); }, fail: function(res) { console.log(res); } }, that); },500)) }, that是在全局里定义的，在onload() 里 赋值 that = this；

一直报这个错:anvasToTempFilePath: fail canvas is empty [代码]<[代码][代码]view[代码] [代码]class[代码][代码]=[代码][代码]"Canvas_box"[代码] [代码]wx:if[代码][代码]=[代码][代码]"{{canvasHidden}}"[代码][代码]>[代码][代码]  [代码][代码]<[代码][代码]canvas[代码] [代码]class[代码][代码]=[代码][代码]"Canvas"[代码] [代码]canvas-id[代码][代码]=[代码][代码]"myCanvas"[代码] [代码]/>[代码][代码]  [代码][代码]<[代码][代码]view[代码] [代码]class[代码][代码]=[代码][代码]"save"[代码] [代码]catch:tap[代码][代码]=[代码][代码]"handSaveImg"[代码][代码]>保存图片</[代码][代码]view[代码][代码]>[代码][代码]</[代码][代码]view[代码][代码]>[代码][代码]createNewImg() {[代码][代码]  [代码][代码]var[代码] [代码]that = [代码][代码]this[代码][代码]  [代码][代码]var[代码] [代码]context = wx.createCanvasContext([代码][代码]'myCanvas'[代码][代码])[代码][代码]  [代码][代码]context.setFillStyle([代码][代码]'#fff'[代码][代码])[代码][代码]  [代码][代码]context.fillRect(0, 0, 375, 667)[代码][代码]  [代码][代码]var[代码] [代码]path = [代码][代码]'/images/bannerbj.png'[代码][代码]  [代码][代码]console.log(path)[代码][代码]  [代码][代码]context.drawImage(path, 0, 0, 340, 550)[代码][代码]  [代码][代码]context.setFontSize(14)[代码][代码]  [代码][代码]context.setFillStyle([代码][代码]'#333333'[代码][代码])[代码][代码]  [代码][代码]context.setTextAlign([代码][代码]'center'[代码][代码])[代码][代码]  [代码][代码]let name = [代码][代码]this[代码][代码].data.name[代码][代码]  [代码][代码]context.fillText(name, 175, 235)[代码][代码]  [代码][代码]context.stroke()[代码] [代码]  [代码][代码]context.setFontSize(50)[代码][代码]  [代码][代码]context.setFillStyle([代码][代码]'#333333'[代码][代码])[代码][代码]  [代码][代码]context.setTextAlign([代码][代码]'center'[代码][代码])[代码][代码]  [代码][代码]let score = [代码][代码]this[代码][代码].data.score[代码][代码]  [代码][代码]context.fillText(score, 162, 180)[代码][代码]  [代码][代码]context.stroke()[代码][代码]  [代码][代码]// context.draw(false, this.saveCanvasToFile())[代码][代码]  [代码][代码]context.draw([代码][代码]false[代码][代码], e => {[代码][代码]    [代码][代码]wx.canvasToTempFilePath([代码][代码]      [代码][代码]{[代码][代码]        [代码][代码]canvasId: [代码][代码]'myCanvas'[代码][代码],[代码][代码]        [代码][代码]quality: 1,[代码][代码]        [代码][代码]success: res => {[代码][代码]          [代码][代码]this[代码][代码].setData({[代码][代码]            [代码][代码]canvasTemImg: res.tempFilePath,[代码][代码]            [代码][代码]canvasHidden: [代码][代码]true[代码][代码]          [代码][代码]})[代码][代码]        [代码][代码]},[代码][代码]        [代码][代码]fail: res => {[代码][代码]          [代码][代码]console.log(res)[代码][代码]        [代码][代码]}[代码][代码]      [代码][代码]},[代码][代码]      [代码][代码]this[代码][代码]    [代码][代码])[代码][代码]  [代码][代码]})[代码][代码]},[代码][代码]saveCanvasToFile() {[代码][代码]  [代码][代码]let that = [代码][代码]this[代码][代码]  [代码][代码]setTimeout(() => {[代码][代码]    [代码][代码]console.log([代码][代码]'123123123'[代码][代码])[代码] [代码]    [代码][代码]wx.canvasToTempFilePath([代码][代码]      [代码][代码]{[代码][代码]        [代码][代码]canvasId: [代码][代码]'myCanvas'[代码][代码],[代码][代码]        [代码][代码]quality: 1,[代码][代码]        [代码][代码]success: res => {[代码][代码]          [代码][代码]this[代码][代码].setData({[代码][代码]            [代码][代码]canvasTemImg: res.tempFilePath,[代码][代码]            [代码][代码]canvasHidden: [代码][代码]true[代码][代码]          [代码][代码]})[代码][代码]        [代码][代码]},[代码][代码]        [代码][代码]fail: res => {[代码][代码]          [代码][代码]console.log(res)[代码][代码]        [代码][代码]}[代码][代码]      [代码][代码]},[代码][代码]      [代码][代码]this[代码][代码]    [代码][代码])[代码][代码]  [代码][代码]}, 2000)[代码][代码]},[代码]